Failure gave me an inner security that I had never attained by passing examinations. Failure taught me things about myself that I could have learned no other way. I discovered that I had a strong will, and more discipline than I had suspected; I also found out that I had friends whose value was truly above the price of rubies.

用户需求是产品开发的出发点，也是落脚点。

在一个不自由的世界里，唯一的应对方式是变得如此绝对自由，以至于你的存在本身就是一种反叛。

解释：对别人没有恩德，却想有求于人，这是罪过。